Figure
6-84.
Diagram
of
Gain
Compression
Figure
6-85
illustrates
a
simultaneous
measurement
of
fundamental
gain
compression and
second
harmonic
power
as
a
function
of
input
power
.
Figure 6-85.
Swept P
ower Measurement of Amplier's Fundamental Gain Compression and 2nd
Harmonic Output Level
In
a compression measurement it is necessary to know the RF input or output power at a
certain level of gain compression. Therefore
, both gain and
absolute power level need to be
accurately characterized. Uncertainty in a gain compression measurement is typically less
than 0.05 dB
.Also
, each input channel of the analyzer
is calibrated to display absolute power
(typically within +0.5 dBm up to 3 GHz, and +1 dB up to 6 GHz).
Application and Operation Concepts 6-147
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